Department of Public and Occupational Health, Amsterdam Public Health Research Institute, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
Research Center for Insurance Medicine, AMC-UMCG-UWV-VUmc, Amsterdam, The Netherlands.
Ann Work Expo Health. 2019 May 21;63(5):583-591. doi: 10.1093/annweh/wxz022.
Sit-stand workstations are a popular intervention to reduce sedentary behavior (SB) in office settings. However, the extent and distribution of SB in office workers long-term accustomed to using sit-stand workstations as a natural part of their work environment are largely unknown. In the present study, we aimed to describe patterns of SB in office workers with long-term access to sit-stand workstations and to determine the extent to which these patterns vary between days and workers.
SB was objectively monitored using thigh-worn accelerometers for a full week in 24 office workers who had been equipped with a sit-stand workstation for at least 10 months. A comprehensive set of variables describing SB was calculated for each workday and worker, and distributions of these variables between days and workers were examined.
On average, workers spent 68% work time sitting [standard deviation (SD) between workers and between days (within worker): 10.4 and 18.2%]; workers changed from sitting to standing/walking 3.2 times per hour (SDs 0.6 and 1.2 h-1); with bouts of sitting being 14.9 min long (SDs 4.2 and 8.5 min). About one-third of the workers spent >75% of their workday sitting. Between-workers variability was significantly different from zero only for percent work time sitting, while between-days (within-worker) variability was substantial for all SB variables.
Office workers accustomed to using sit-stand workstations showed homogeneous patterns of SB when averaged across several days, except for percent work time seated. However, SB differed substantially between days for any individual worker. The finding that many workers were extensively sedentary suggests that just access to sit-stand workstations may not be a sufficient remedy against SB; additional personalized interventions reinforcing use may be needed. To this end, differences in SB between days should be acknowledged as a potentially valuable source of variation.
坐站式工作站是一种减少办公环境中久坐行为（SB）的流行干预措施。然而，长期习惯于将坐站式工作站作为自然工作环境一部分的办公人员中 SB 的程度和分布在很大程度上是未知的。在本研究中，我们旨在描述长期使用坐站式工作站的办公人员中 SB 的模式，并确定这些模式在工作日和工人之间的差异程度。
使用大腿佩戴的加速度计在 24 名办公人员中进行了整整一周的 SB 客观监测，这些办公人员配备坐站式工作站至少 10 个月。为每个工作日和工人计算了一组描述 SB 的综合变量，并检查了这些变量在工作日和工人之间的分布。
平均而言，工人在工作时间中坐着的时间占 68%（工人之间和工作日之间的标准差：10.4%和 18.2%）；工人每小时从坐着变为站立/走动 3.2 次（标准差为 0.6 和 1.2 h-1）；坐着的时间为 14.9 分钟（标准差为 4.2 和 8.5 分钟）。大约三分之一的工人在工作时间中有超过 75%的时间坐着。只有在工作时间中坐着的百分比方面，工人之间的变异性显著不为零，而在任何一个工作日内，所有 SB 变量的变异性都很大。
习惯于使用坐站式工作站的办公人员在几个工作日内平均表现出同质的 SB 模式，除了工作时间中坐着的百分比。然而，对于任何一个工人来说，SB 在工作日之间有很大的差异。许多工人久坐不动的发现表明，仅仅获得坐站式工作站可能不足以解决 SB 问题；可能需要额外的个性化干预措施来加强使用。为此，应该承认工作日之间的 SB 差异是一种潜在有价值的变异性来源。
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